Figure 1.

Scheme of the fabrication method. Polystyrene-coated gold nanoparticles were deposited on silicon substrates using spin-coating. The generated highly ordered arrays of gold nanoparticles were thermally treated in order to remove the polymer matrix. Finally, the substrates were etched in a mixture of HF and H2O2 resulting in the formation of porous silicon.

Scheeler et al. Nanoscale Research Letters 2012 7:450   doi:10.1186/1556-276X-7-450
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